Connecticut's 3rd congressional district (CT-03)
Connecticut's 3rd congressional district (CT-03) covers parts or all of South Central Connecticut Planning Region, Naugatuck Valley Planning Region, Lower Connecticut River Valley Planning Region and Greater Bridgeport Planning Region, and 40 ZIP codes (31 wholly inside it). Its 2020 population was 721,189. This is the map in force for the November 3, 2026 election.
Who represents CT-03
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (CT-03) | Rosa L. DeLauro (D) | 202-225-3661 |
| U.S. Senator | Christopher Murphy (D) | 202-224-4041 · contact form |
| U.S. Senator | Richard Blumenthal (D) | 202-224-2823 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in CT-03 |
|---|---|
| South Central Connecticut Planning Region | 86% |
| Naugatuck Valley Planning Region | 32% |
| Lower Connecticut River Valley Planning Region | 20% |
| Greater Bridgeport Planning Region | 16% |
ZIP codes
Percentages mark ZIPs only partly in CT-03: the share of that ZIP's residents inside it.
- 06401
- 06403
- 06405
- 06410 (<0.1%)
- 06418
- 06422
- 06437
- 06443 (0.1%)
- 06455
- 06457 (47%)
- 06459 (98%)
- 06460
- 06461
- 06471
- 06472
- 06473
- 06477
- 06481
- 06483
- 06484 (68%)
- 06492 (100%)
- 06510
- 06511
- 06512
- 06513
- 06514
- 06515
- 06516
- 06517
- 06518
- 06519
- 06524
- 06525
- 06607 (<0.1%)
- 06614
- 06615
- 06706 (73%)
- 06708 (29%)
- 06712
- 06770
Towns
Ansonia town, Beacon Falls town, Bethany town, Branford town, Derby town, Durham town, East Haven town, Guilford town, Hamden town, Middlefield town, Milford town, Naugatuck town, New Haven town, North Branford town, North Haven town, Orange town, Prospect town, Seymour town, Stratford town, Wallingford town, West Haven town, Woodbridge town, Shelton town, Middletown town and Waterbury town.
Get this in your AI agent
Your agent can draw every precinct in CT-03, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:0903", children_level="precinct", include_districts=True)